Blue A10:
This is all good to know; is it also the case for HDR or just SDR? I probably should've mentioned before that all this is happening with HDR. I apologize for that as well, and thank you both for your replies.
In this case, HDR does not support 'whiter than white' (WTW), and the 100% White is set at 10,000 nits.
With the television contrast set to 100, no extended range is available; therefore, the LEGAL setting must be used.
For SDR you have to use Contrast 85. (or lower if required)
For HDR you have to use Contrast 100.